KR101652593B1 - Motor-driven compressor - Google Patents

Motor-driven compressor Download PDF

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Publication number
KR101652593B1
KR101652593B1 KR1020140168379A KR20140168379A KR101652593B1 KR 101652593 B1 KR101652593 B1 KR 101652593B1 KR 1020140168379 A KR1020140168379 A KR 1020140168379A KR 20140168379 A KR20140168379 A KR 20140168379A KR 101652593 B1 KR101652593 B1 KR 101652593B1
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South Korea
Prior art keywords
voltage
temperature
temperature threshold
switching
control unit
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KR1020140168379A
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Korean (ko)
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KR20150065579A (en
Inventor
준야 야노
츠요시 야마구치
다츠야 고이데
겐 스이토오
요시키 나가타
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가부시키가이샤 도요다 지도숏키
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Publication of KR20150065579A publication Critical patent/KR20150065579A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/10—Voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S418/00—Rotary expansible chamber devices
    • Y10S418/01—Non-working fluid separation

Abstract

A motor-driven compressor according to the present invention includes an electric motor driven by a motor driver including a switching element for converting a DC voltage from a battery to an AC voltage. The control unit controls the switching operation of the switching element. A temperature detector detects the temperature of the switching element. A voltage detector detects the DC voltage applied to the switching element from the battery. The control unit stops the switching operation of the switching element when the temperature detected by the temperature detector is raised to a predetermined temperature threshold. The control unit also reduces the counter electromotive force generated by the electric motor. The temperature threshold comprises a first temperature threshold corresponding to the inductance temperature of the switching element and a second temperature threshold greater than the first temperature threshold. The control unit switches the temperature threshold between the first and second temperature thresholds.

Description

[0001] MOTOR-DRIVEN COMPRESSOR [0002]

Cross-reference to related application

This application is based on and claims the benefit of priority from prior Japanese patent application No. 2013-252256, filed December 5, 2013, the entire contents of which are incorporated herein by reference.

The present invention relates to a motor-driven compressor.

Japanese Patent Laid-Open No. 2005-201108 discloses an example of a typical motor-driven compressor including a compression unit for compressing and discharging refrigerant, an electric motor for driving the compression unit, and a motor driver for driving the electric motor . The motor driver includes a switching element. The switching element performs a switching operation so that the motor driver converts the DC voltage of the battery (DC power source) to an AC driving voltage and applies a driving voltage to the electric motor to drive the electric motor.

The switching element generates heat when performing the switching operation. For example, when the switching operation of the switching element generates a large amount of heat, the temperature of the switching element may exceed the withstanding temperature of the switching element. This can damage the switching element.

The inventors of the present invention have conducted studies on a controller of the reference example using a temperature threshold to stop the driving of the electric motor. The controller of the electric motor stops the switching operation of the switching element when, for example, the temperature of the switching element detected by the temperature detector is raised to the temperature threshold. Under the assumption that the drive torque of the motor-driven compressor is constant, the switching loss of the switching element is increased as the DC voltage applied to the switching element is increased. An increase in the switching loss increases the rising speed of the temperature of the switching element. Further, the temperature detected by the temperature detector may be different from the actual temperature of the switching element. The temperature threshold is set as a fixed value that is equal to the output value of the temperature detector when the highest voltage within the applicable voltage range of the battery is applied to the motor-driven compressor, since the controller is difficult to accurately obtain the actual temperature of the switching element.

In an electric motor, rotation generated by an electric motor generates a magnetic flux which generates a counter electromotive force. An increase in the rotational speed of the electric motor increases the counter electromotive force. When the counter electromotive force becomes equal to the drive voltage applied to the electric motor, the rotational speed of the electric motor can not be increased. For example, when the DC voltage is a low voltage within the applicable voltage range of the battery, the counter electromotive force becomes easily equal to the driving force applied to the electric motor, and the rotational speed of the electric motor can not be raised in such a case. This situation is not desirable.

Field weakening control is known to reduce counter electromotive force. The weak field control reduces the counter electromotive force by supplying current from the motor driver to the electric motor to weaken the magnetic flux generated by the rotation of the electric motor. This causes the electric motor to operate at a high fixed torque and at an increased rotational speed even when the DC voltage is a low voltage within the applicable voltage range of the battery.

The amount of current supplied from the motor driver to the electric motor alters or affects the relationship between the actual temperature of the switching element and the temperature detected by the temperature detector. For example, an increase in the amount of current flowing to the circuit board of the motor driver increases the heat transferred from the circuit board to the temperature detector. This increases the heat generated from the circuit board, increases the heat transferred from the circuit board to the temperature detector, and raises the temperature of the temperature detector itself. The weak field control performed when the DC voltage is a low voltage within the applicable voltage range of the battery can raise the temperature of the temperature detector itself. For example, when the temperature of the temperature detector itself is raised according to the current which weakens the magnetic flux supplied from the motor driver to the electric motor, the temperature (output value) detected by the temperature detector is raised so that the actual temperature of the switching element But may exceed the temperature threshold. In this case, the switching operation of the switching element is stopped, the electric motor is stopped, and the operation of the motor-driven compressor is stopped even though it is not necessary to do so.

It is therefore an object of the present invention to provide a motor-driven compressor capable of restricting unnecessary operation stop caused by switching element overheat protection control when the DC voltage applied to the switching element is a low voltage within an applicable voltage range .

One aspect of the present invention is a motor-driven compressor including an electric motor for driving a compression unit. The motor driver drives the electric motor. The motor driver includes a switching element for converting the DC voltage from the battery to an AC voltage. The control unit controls the switching operation of the switching element. A temperature detector detects the temperature of the switching element. A voltage detector detects the DC voltage applied to the switching element from the battery. The control unit is configured to execute stop control for stopping the switching operation of the switching element when the temperature detected by the temperature detector is raised to a predetermined temperature threshold and weak field control for reducing counter electromotive force generated by the electric motor. (A) a first temperature threshold set to an output value of a temperature detector indicative of a persisting temperature of the switching element when the DC voltage of the battery is the highest voltage within the applicable voltage range of the battery, and (b) And a second temperature threshold higher than the threshold. The control unit executes a first switching control for switching from the first temperature threshold to the second temperature threshold when the DC voltage detected by the voltage detector falls below a predetermined first voltage value within an applicable voltage range.

Other aspects and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the preferred embodiments of the invention, together with the accompanying drawings, wherein: FIG.
1 is a side cross-sectional view illustrating one embodiment of a motor-driven compressor;
2 is a circuit diagram of a motor driver;
3 is a graph showing the relationship between the DC voltage of the battery and the temperature threshold.
4 is a graph showing the switching of the temperature threshold and the change in temperature detected by the temperature detector;
5 is a graph showing the switching of the temperature threshold and the change in temperature detected by the temperature detector;
Figure 6 is a graph showing the switching of the temperature threshold in a further embodiment and the change in temperature detected by the temperature detector;

One embodiment of a motor-driven compressor will now be described with reference to Figures 1-5. The motor-driven compressor is installed in a vehicle, for example, and is used together with a vehicle air conditioner.

1, the motor-driven compressor 10 includes a compression unit 12 for compressing and discharging refrigerant, an electric motor 13 for driving the compression unit 12, and a motor And a driver 20. The compression unit (12) and the electric motor (13) are housed in a housing (11). The compression unit 12 includes a fixed scroll 12a fixed in the housing 11 and a movable scroll 12b engaged with the fixed scroll 12a. The electric motor 13 includes a rotor 13a fixed to the rotating shaft 15 and rotated integrally therewith and a stator 13b fixed to the inner surface of the housing 11. [

The motor driver 20 may be located outside the housing 11, for example. In the illustrated example, the motor driver 20 is accommodated in a void defined by the cover 16 fixed to the end wall of the housing 11 and the end wall of the housing 11. [ In this embodiment, the compression unit 12, the electric motor 13 and the motor driver 20 are arranged in this order in the direction (axial direction) in which the axis L of the rotating shaft 15 extends.

As shown in FIG. 2, the motor driver 20 includes switching elements 21 and 22 and a current smoothing capacitor 23. A diode 24 is connected to each of the switching elements 21,22. The diode 24 returns the counter electromotive force generated in the electric motor 13 by the battery 25 (DC power source). The switching element 21 may be referred to as an upper arm switching element, and the switching element 22 may be referred to as a lower arm switching element.

Each base of the switching elements 21, 22 is signal-connected to a control unit 30, which may be a computer including a processor and a memory. The control unit 30 controls the switching operation of each of the switching elements 21 and 22. The collector of each switching element 21 is connected to a battery 25. The emitter of each switching element 21 is connected to the coil 13c of the electric motor 13. [ The emitter of each switching element 22 is connected to a battery 25. The collector of each switching element 22 is connected to the coil 13c of the electric motor 13.

The motor driver 20 controls the driving voltage of the electric motor 13 through pulse-width modulation. For example, the motor driver 20 generates a PWM signal from a carrier wave, which may be a high frequency triangle wave signal and a voltage assignment signal that specifies the voltage to be generated. The motor driver 20 provides a PWM signal to each of the switching elements 21,22. Each of the switching elements 21 and 22 performs a switching operation in accordance with the PWM signal to convert the DC voltage applied to each of the switching elements 21 and 22 from the battery 25 to an AC driving voltage. The AC drive voltage obtained in this manner is applied to the electric motor 13 to control and drive the electric motor 13. [

The control unit 30 is electrically connected to a temperature detector 31 which detects the temperature of the switching elements 21, For example, the temperature detector 31 may be a thermistor located close to the switching elements 21, 22. The output (detected temperature or output value) of the temperature detector 31 is provided to the control unit 30. [

The temperature detected by the temperature detector 31 may be different from the actual temperature of the switching elements 21, 22. Further, the control unit 30 stores a set of temperature estimate values that can be referred to as a set of reference values. A set of temperature estimate values are obtained in advance based on the relationship between the inrush temperature of the switching elements 21 and 22, the DC voltage of the battery 25, and the temperature detected by the temperature detector 31. For example, a set of temperature estimate values may be determined by converting the actual in-pass temperature to the output value of the temperature detector 31 at various DC voltages. In some embodiments, the temperature estimate values are associated with different DC voltages of the battery 25, and each of the temperature estimate values corresponds to a temperature detector output value indicative of the endurance temperature of the switching elements 21, 22 at the corresponding DC voltage May be the same or corresponding thereto.

3, a solid line L1 shows the relationship between the DC voltage of the battery 25 and the estimated temperature value when the drive torque of the motor-driven compressor 10 is fixed high.

Under the assumption that the drive torque of the motor-driven compressor 10 is fixed, the higher DC voltage of the battery 25 increases the switching loss of the switching elements 21 and 22, so that the temperature of the switching elements 21 and 22 Thereby raising the rising speed. Thus, as the DC voltage of the battery 25 rises, the temperature estimate value is set to be lower.

2, a voltage detector 32 for detecting the DC voltage applied to the switching elements 21 and 22 from the battery 25 is electrically connected to the control unit 30. [ The output (detected voltage or output value) of the voltage detector 32 is sent to the control unit 30.

When the temperature detected by the temperature detector 31 rises and reaches a predetermined temperature threshold T, the control unit 30 executes the stop control to stop the switching operation of the switching elements 21 and 22. [ The temperature threshold T may be a temperature that is below the estimated temperature value.

The temperature threshold T may comprise a plurality of different values, preferably two, depending on the detected DC voltage. For example, referring to FIG. 3, at a set of temperature estimate values L1, the temperature threshold T is such that the DC voltage is within the applicable voltage range of the battery 25 normally used by the motor- A first temperature threshold T1 equal to the temperature estimate value at the highest voltage Vmax (e.g., 400 V), and a second temperature threshold T2 set at a temperature higher than the first temperature threshold T1. In one set of temperature estimate values L1, the second temperature threshold T2 is lower than the estimated temperature value when the DC voltage is the lowest voltage Vmin (e.g., 100 V) within the applicable voltage range of the battery 25. For example, in consideration of the measurement error, the second temperature threshold T2 may be a temperature estimate value or a voltage corresponding to a second voltage value V2 (e.g., 250 V) that is higher than the first voltage value V1 within the applicable voltage range of the battery 25 It may be lower than the estimated temperature value corresponding to Vmin as much as the safety margin.

The control unit 30 executes weak field control to reduce the counter electromotive force generated by the rotation of the electric motor 13. [ Weak field control will now be described.

In the electric motor 13, the counter electromotive force is generated by the magnetic flux generated by the rotation of the electric motor 13. The rotational speed of the electric motor 13 is controlled such that the driving torque of the motor-driven compressor 10 is fixed high when the DC voltage is a low voltage (for example, 100 V to 200 V) within the applicable voltage range of the battery 25 It is necessary to rise. An increase in the rotational speed of the electric motor 13 increases the counter electromotive force. When the counter electromotive force becomes equal to the drive voltage applied to the electric motor 13, the rotational speed of the electric motor 13 can not be raised.

The weak field control executed by the control unit 30 reduces the back electromotive force by supplying electric current to the electric motor 13 to weaken the magnetic flux generated by the rotation of the electric motor 13. [ Thus, in the motor-driven compressor 10, the drive torque of the motor-driven compressor 10 can be set to a high fixed torque even when the DC voltage is a low voltage within the applicable voltage range of the battery 25 have.

When the DC voltage detected by the voltage detector 32 falls and becomes a predetermined first voltage value V1 (e.g., 200 V) within the applicable voltage range of the battery 25, the control unit 30 performs the first switching Control to switch the temperature threshold T from the first temperature threshold T1 to the second temperature threshold T2. Further, when the DC voltage detected by the voltage detector 32 rises to be higher than a second voltage value V2 (for example, 250 V) higher than a predetermined first voltage value V1 within the applicable voltage range of the battery 25, The control unit 30 performs the second switching control to switch the temperature threshold T from the second temperature threshold T2 to the first temperature threshold T1. In one example, the control unit 30 executes the first switching control at time point P1 when the DC voltage detected by the voltage detector 32 falls to the first voltage value V1.

Referring to Fig. 2, the control unit 30 includes a timer 30a. The control unit 30 determines whether the DC voltage detected by the voltage detector 32 is higher than the second voltage value V2 after the predetermined time Tx has elapsed (e.g., at P2 in FIG. 5) And performs switching control. The timer 30a measures time to determine when a predetermined time Tx has elapsed.

The operation of this embodiment will now be described.

For example, when the DC voltage applied to the switching element is a low voltage within the applicable voltage range of the battery 25, the control unit 30 executes the weak field control so that the drive torque of the motor-driven compressor 10 is high . In the field weakening control, electric current is supplied from the motor driver 20 to the electric motor 13 to weaken the magnetic flux generated by the rotation of the electric motor 13. [ The output of the current from the motor driver 20 to the electric motor 13 raises the temperature of the temperature detector 31. For example, an increase in the amount of current flowing to the circuit board (not shown) of the motor driver 20 increases the amount of heat generated from the circuit board and the amount of heat transmitted from the circuit board to the temperature detector 31. This raises the temperature of the temperature detector 31.

A solid line L2 in Fig. 3 shows the relationship between the DC voltage of the battery 25 and the temperature detected by the temperature detector 31 when the drive torque of the motor-driven compressor 10 is a fixed fixed torque have.

In this example, the temperature detected by the temperature detector 31 when the DC voltage is a low voltage (e.g., 100 V to 200 V) within the applicable voltage range of the battery 25 is such that the DC voltage is applied to the battery 25 Is higher than the temperature detected by the temperature detector 31 at an intermediate voltage (for example, 200 V to 300 V) within a possible voltage range. Further, the temperature detected by the temperature detector 31 when the DC voltage is a high voltage (for example, 300 V to 400 V) within the applicable voltage range of the battery 25 is determined by the DC voltage being applied to the applicable voltage Is higher than the temperature detected by the temperature detector 31 at an intermediate voltage in the range.

4, the control unit 30 controls the temperature threshold T (from the first temperature threshold T1 to the second temperature threshold T2) at a point P1 when the DC voltage detected by the voltage detector 32 drops to the first voltage value V1 The first switching control is performed. An undesirable situation that may occur when the first switching control is not performed will now be described. 4, a solid line L3 shows a change in the temperature detected by the temperature detector 31. As shown in Fig. For example, if the temperature threshold T remains at the first temperature threshold T1 when the control unit 30 performs weak field control, a sufficient margin exists between the temperature of the switching elements 21 and 22 and the tolerance temperature The temperature detected by the temperature detector 31 can be raised to the first temperature threshold T1. In this case, the control unit 30 performs stop control to stop the operation of the motor-driven compressor 10. [

The control unit 30 executes the first switching operation to avoid this undesirable situation. That is, the temperature threshold T is switched from the first temperature threshold T1 to the second temperature threshold T2 at the time point P1 so that when the sufficient margin is present between the temperature of the switching elements 21 and 22 and the in- Thereby limiting the execution of the control. As a result, when the DC voltage is a low voltage within the applicable voltage range of the battery 25, the operation of the motor-driven compressor 10 when sufficient clearance is present between the temperature of the switching elements 21, Is stopped.

5, the control unit 30 starts measuring the time by operating the timer 30a at time point P2 when the DC voltage detected by the voltage detector 32 is raised to the second voltage value V2 (See FIG. 3). When the predetermined time Tx elapses, the control unit 30 performs the second switching control to switch the temperature threshold T from the second temperature threshold T2 to the first temperature threshold T1. In Fig. 5, a solid line L3 shows a change in the temperature detected by the temperature detector 31. Fig.

For example, at a time point P2 when the DC voltage detected by the voltage detector 32 is raised to the second voltage value V2, the temperature detected by the temperature detector 31 may exceed the first temperature threshold T1. If the control unit 30 has executed the second switching control at the time point P2, the control unit 30 would have executed the stop control to stop the switching operation of the switching elements 21 and 22. [

The control unit 30 performs the second switching control after a predetermined time Tx elapses from the time point P2 when the DC voltage detected by the voltage detector 32 is raised to the second voltage value V2, .

Further, if the temperature threshold T remains at the second temperature threshold T2, for example, when the DC voltage is at the maximum voltage Vmax within the applicable voltage range of the battery 25, the temperature detected by the temperature detector 31 becomes the in- The control unit 30 may not execute the stop control.

The control unit 30 avoids this undesirable situation by executing the second switching control when the DC voltage detected by the voltage detector 32 becomes equal to or higher than the second voltage value V2. More specifically, the control unit 30 determines whether the temperature detected by the temperature detector 31 when the DC voltage is at the maximum voltage Vmax within the applicable voltage range of the battery 25 is increased to the estimated temperature value, And executes the stop control. This stops the switching operation of the switching elements 21, 22.

The above embodiment has the following advantages.

(1) When the DC voltage detected by the voltage detector 32 is lower than a predetermined first voltage value V1 that is within the applicable voltage range of the battery 25, the control unit 30 changes from the first temperature threshold T1 And executes the first switching control for switching the threshold value T to the second temperature threshold value T2. Thus, for example, as compared to when the temperature threshold T remains at the first temperature threshold T1, execution of the stop control by the control unit 30 when sufficient clearance exists between the temperature of the switching elements 21, 22 and the in- Is limited. As a result, if the DC voltage is a low voltage within the applicable voltage range of the battery 25, it is possible to prevent the operation of the motor-driven compressor 10 when a sufficient margin exists between the temperature of the switching elements 21, Stopping is restricted.

(2) If, for example, the temperature threshold T remains at the second temperature threshold T2 when the DC voltage is at the maximum voltage Vmax within the applicable voltage range of the battery 25, the temperature detected by the temperature detector 31 becomes the in- Temperature estimated value), the control unit 30 may not execute the stop control. In this way, when the DC voltage detected by the voltage detector 32 rises and becomes equal to or higher than the second voltage value V2, the control unit 30 executes the second switching control to change from the second temperature threshold T2 to the first temperature threshold And switches the temperature threshold T to T1. As a result, if the temperature detected by the temperature detector 31 when the DC voltage is the maximum voltage Vmax within the applicable voltage range of the battery 25 is raised to the estimated temperature value, i.e., the first temperature threshold T1, This stop control is executed. This avoids an undesirable situation in which the control unit 30 does not perform stop control when the temperature detected by the temperature detector 31 is raised to the in-pass temperature.

(3) At a time point P2 when, for example, the DC voltage detected by the voltage detector 32 is raised to the second voltage value V2, the temperature detected by the temperature detector 31 may exceed the first temperature threshold T1 have. In this case, when the control unit 30 executes the second switching control at the time point P2 when the DC voltage detected by the voltage detector 32 reaches the second voltage value V2, . Thus, the control unit 30 executes the second switching control after a predetermined time Tx has elapsed from the time point P2 when the DC voltage detected by the voltage detector 32 is raised to the second voltage value. This avoids the undesirable situation in which the control unit 30 performs the stop control due to the temperature detected by the temperature detector 31 at a point P2 higher than the first temperature threshold T1.

(4) Preferably, the temperature threshold T is only two in terms of the number of processes in the control program, the memory capacity required for the control unit 30 to store the control program, the computational load, and the power consumed in the computation That is, between the first temperature threshold T1 and the second temperature threshold T2. Nevertheless, multiple temperature thresholds T can be set in the control unit 30 in accordance with different DC voltages of the battery 25.

It will be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit of the invention. In particular, it should be understood that the present invention may be embodied in the following forms.

Referring to Fig. 6, the second switching control executed by the control unit 30 is such that when the DC voltage detected by the voltage detector 32 rises from the time point P2 to the second voltage value V2 from the second temperature threshold T2 The value of the threshold value T can be gradually reduced to the first temperature threshold T1. This is because the temperature detected by the temperature detector 31 larger than the first temperature threshold T1 at the time point P2 when the DC voltage detected by the voltage detector 32 is raised from the time point P2 to the second voltage value V2 30) to execute the stop control.

The control unit 30 can execute the second switching control at time point P2 when the DC voltage detected by the voltage detector 32 is raised to the second voltage value V2.

The control unit 30 can execute the first switching control after a predetermined time from the time point P1 when the DC voltage detected by the voltage detector 32 falls to the first voltage value V1.

For example, a thermocouple or a radiation thermistor may be used as the temperature detector 31.

The motor driver 20 can be accommodated in the void defined by the circumferential wall of the housing 11 and the cover 16 when the cover 16 is secured to the circumferential wall of the housing 11. [

The compression unit 12 may be, for example, a piston type, a vane type, or the like.

The motor-driven compressor 10 need not be used with a vehicle air conditioner, but can be used with different types of air conditioners.

The description above is intended to be illustrative and not restrictive. For example, the above-described example (or one or more of its aspects) may be used in combination with each other. Other embodiments may be used by those skilled in the art, for example, as discussed above. Furthermore, in the above description of these embodiments, various features may be incorporated together to simplify the disclosure. This should not be interpreted as intended to imply that the claimed features which are not claimed are essential to any claim. Rather, the subject matter of the invention may lie in less than all features of a particular disclosed embodiment. As such, the following claims are hereby incorporated herein by reference in their entirety, wherein each claim is itself independent as a separate embodiment. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Claims (5)

A motor-driven compressor,
An electric motor for driving the compression unit;
1. A motor driver for driving an electric motor, the motor driver comprising: a switching element for converting a DC voltage from the battery to an AC voltage;
A control unit for controlling a switching operation of the switching element;
A temperature detector for detecting the temperature of the switching element;
A voltage detector for detecting a DC voltage applied to the switching element from the battery
Lt; / RTI >
The control unit,
A stop control for stopping the switching operation of the switching element when the temperature detected by the temperature detector is raised to a predetermined temperature threshold,
Weak field control to reduce the back electromotive force generated by the electric motor
, ≪ / RTI >
The temperature threshold,
A first temperature threshold set to be equal to an output value of a temperature detector indicative of a persevering temperature of a switching element when the DC voltage of the battery is the highest voltage within an applicable voltage range of the battery,
A second temperature threshold < RTI ID = 0.0 >
Lt; / RTI >
The control unit executes a first switching control for switching from a first temperature threshold to a second temperature threshold when the DC voltage detected by the voltage detector falls below a predetermined first voltage value within an applicable voltage range,
Motor-driven compressors. 2. The method of claim 1, wherein the control unit is configured to switch from a second temperature threshold to a first temperature threshold when the DC voltage detected by the voltage detector is raised to a second voltage value greater than a first voltage value within an applicable voltage range, The second switching control being performed by the first switching control means. 3. The motor-driven compressor according to claim 2, wherein the control unit executes the second switching control after a predetermined time elapses from when the DC voltage detected by the voltage detector is raised to the second voltage value . The control apparatus according to claim 2, wherein the control unit controls the second switching control so that the threshold is gradually decreased from the second temperature threshold to the first temperature threshold when the DC voltage detected by the voltage detector is raised to the second voltage value Motor-driven compressor. 5. The motor-driven compressor according to any one of claims 1 to 4, wherein the control unit executes the first switching control at a time when the DC voltage detected by the voltage detector reaches a first voltage value .
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DE102014224733A1 (en) 2015-06-11
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KR20150065579A (en) 2015-06-15
US20150159651A1 (en) 2015-06-11

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